pH readings don't make sense


Bronze Supporter
Apr 9, 2020
Claremore, OK
Hi all,
Last 3 days in August, my pH readings were 8 (TA 100). I added muriatic acid to bring pH to 7.2, and TA went to 90. pH was consistently 7.4 for 5 days, then was at 7.8 and 8. I added more muriatic
acid and TA went to 80 (which was where it was almost all of last season).
The last 6 days, my pH was: 7.4 7.6 7 7.8 7.2 7.8
My FC has averaged 5 (3 low and 6 as high). My CYA is 40.

Why the variations in pH? Just seems like I'm having a harder time with this and keeping FC in ideal range as compared to last year.
Any thoughts? Thank you


Gold Supporter
LifeTime Supporter
TFP Guide
Jul 3, 2013
Southern OK
Pool Size
Salt Water Generator
SWG Type
CircuPool SJ-40
How long have you had your PH red R-0014 ?

Your PH should not be swinging like that and it is either a testing error or old reagent... PH will not go down from7.6 to 7 without MA :)
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